- Eastern Orthodox Church, Gwynn Oak
- Education, Gwynn Oak
- Education & Information Services, Gwynn Oak
- Educational Consultants, Gwynn Oak
- Educational Consultants, Gwynn Oak
- Educational Facilities, Gwynn Oak
- Educational, Philanthropic & Research Foundations, Gwynn Oak
- Educators, Gwynn Oak
- Electric Companies, Gwynn Oak
- Electric Contractors Commercial & Industrial, Gwynn Oak
- Electrical Control Systems & Materials, Gwynn Oak
- Electricians, Gwynn Oak - Electrical Contractors
- Electronics Manufacturers, Gwynn Oak
- Electronics Repair & Maintenance , Gwynn Oak
- Electronics Stores, Gwynn Oak
- Elementary Schools, Gwynn Oak
- Embroidery, Gwynn Oak
- Emergency Services, Gwynn Oak
- Employment Agencies, Gwynn Oak - Staffing Agencies
- Employment Assistance, Gwynn Oak
- Employment Services, Gwynn Oak
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- Energy & Conservation Agencies, Gwynn Oak
- Engine Rebuild, Repair & Exchange, Gwynn Oak
- Engineer & Architect Services, Gwynn Oak - Engineering & Architecture Service
- Engineering Consultants, Gwynn Oak - Consulting Engineers
- Engineering Services, Gwynn Oak
- Engineers Technical Service, Gwynn Oak
- Engines Gasoline Commercial & Industrial, Gwynn Oak
- Entertainers & Entertainment Groups, Gwynn Oak
- Entertainment & Recreation, Gwynn Oak
- Entertainment Agencies & Bureaus, Gwynn Oak
- Entertainment Services, Gwynn Oak
- Environmental Conservation & Ecological Services, Gwynn Oak - Ecosystem Services
- Environmental Groups, Gwynn Oak
- Environmental Products, Gwynn Oak
- Environmental Services, Gwynn Oak
- Episcopal Churches, Gwynn Oak
- Ethnic Churches, Gwynn Oak
- European Cuisine, Gwynn Oak
- Export Services, Gwynn Oak
- Exporters, Gwynn Oak
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